Standard Resistor Calibration
This procedure determines the value of the internal standards for the different frequencies and
ranges. The Model Z9216 does this by measuring a precisely known resistor and recomputing the
values it uses when calculating the impedance of a part. These values are the primary accuracy
standard of the instrument, so the exact value of the calibration resistor, both real and imaginary parts,
must be known. In addition, the Model Z9216 and the calibration resistors must be placed in a
temperature controlled room and allowed to stabilize at least 30 minutes before attempting calibrate.
The standard cal menu is entered as follows: Press the CAL key until "Std CAL" appears on the
alphanumeric display. Press ENTER once to get into this menu structure. Next press CAL until the
"rAngE” message appears on the left display. From here the desired range can be entered (using the
0 to 3 numeric keys and ENTER) and will appear on the right display.
After the range has been entered, pressing CAL will cycle through a series of menus. Pressing
ENTER in any of these will either load that value or begin the action listed. Two different parameters
must be set, "r Std" (standard resistor resistance value) and "q Std" (Q of the standard resistor).
Resistance values are entered using the Ω, kΩ, and MΩ keys and Q is entered in ppm. Negative Q's
denote capacitive resistors and positive Q's denote inductive ones. The different actions are "StArt
CAL" (start cal), "Fctry CAL" (factory cal) and "quit CAL" (quit cal). These activities will, in order, begin
calibration of the current range, recall the factory default values, or exit the cal menu.
1. Inspect the fixture contacts for dirt or waxy build up. If the fixture appears dirty, clean it.
Remove any adapters or components from the fixture.
2. Perform open and short circuit calibration.
3. Plug the R0 calibration resistor into the fixture. Enter the cal menu as described above and
enter range 0.
• Press CAL until "r Std" (resistance standard) is displayed. Enter the resistance of R0.
• Press CAL to display "q Std: (Q standard) and enter the Q of the standard in ppm.
• Press CAL to display "StArt CAL" (start cal). Begin the calibration by pressing ENTER,
making sure to keep hands and any other objects away from the fixture.
4. Repeat step 3 for the other three ranges (1, 2 and 3). When finished, exit the cal menu by
pressing CAL until "quit CAL" is displayed and then press ENTER.
5. After calibration, verify that the calibration is accurate. Perform open and short circuit
calibration. Insert the standards in the fixture and measure them at 1 kHz, series equivalent
circuit. The R and Q readings should agree to within one least significant digit of the standard
values.
6. Check the standards at different frequencies. Use the series equivalent for the two smaller
resistors and the parallel equivalent for the two larger ones. R should remain relatively
constant and Q should scale with frequency (i.e. Q at 10kHz is 10 × Q at 1 kHz). If any of the
values are too far from the nominal values, recalibrate that range.
7. Before making measurements, run open and short circuit calibration with the fixture
configuration to be used.
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